As far as I know there are no regular way of getting more than 10mbps in Playacar. Or well, I'm actually paying for 10mbps but get around 14. This is, of course, nothing compared to fiber speeds. I think fiber is slowly making it's way here, but the problem is that the Playacar network(s) are quite old and as such getting high speeds are impossible.

Assuming it's the same in both Playacar areas (I live in fase 1), Telmex is the only option.

Perhaps in a few years they will have rebuilt the networks to accommodate fiber cables.